This topic describes how to back up an E-MapReduce (EMR) HBase cluster.

Prerequisites

Two Hadoop clusters are created, and the HBase and ZooKeeper services are added to the clusters. For more information, see Create a cluster.

Procedure

  1. Log on to the master node of the cluster by using SSH.
  2. Create a table and add data to the table.
    1. Enable HBase Shell. 
      hbase shell
    2. Create a table. 
      create 'test','cf'
    3. Add data to the table. 
      put 'test','a','cf:c1',1
put 'test','a','cf:c2',2
put 'test','b','cf:c1',3
put 'test','b','cf:c2',4
put 'test','c','cf:c1',5
put 'test','c','cf:c2',6
    4. Exit HBase Shell. 
      exit
  3. Create a snapshot and query snapshot information.
    1. Create a snapshot. 
      hbase snapshot create -n test_snapshot -t test
    2. Enable HBase Shell. 
      hbase shell
    3. Query snapshot information. 
      list_snapshots
      The following information is returned: 
      SNAPSHOT                                           TABLE + CREATION TIME
 test_snapshot                                     test (Tue Aug 18 14:35:28 +0800 2020)
1 row(s) in 0.2450 seconds

=> ["test_snapshot"]
    4. Exit HBase Shell. 
      exit
  4. Export the created snapshot to OSS. 
    hbase org.apache.hadoop.hbase.snapshot.ExportSnapshot -snapshot test_snapshot -copy-to oss://$accessKeyId:$accessKeySecret@$bucket.oss-cn-hangzhou-internal.aliyuncs.com/hbase/snapshot/test
    Note Use the internal endpoint to access OSS.
  5. Log on to the other cluster by using SSH.
  6. Export the snapshot from OSS. 
    hbase org.apache.hadoop.hbase.snapshot.ExportSnapshot -snapshot test_snapshot -copy-from oss://$accessKeyId:$accessKeySecret@$bucket.oss-cn-hangzhou-internal.aliyuncs.com/hbase/snapshot/test -copy-to /hbase/
  7. Restore data from the snapshot and view data in the restored table.
    1. Enable HBase Shell. 
      hbase shell
    2. Restore data from the snapshot. 
      restore_snapshot 'test_snapshot'
    3. View data in the restored table. 
      scan 'test'
      The following information is returned: 
      ROW                     COLUMN+CELL
 a                      column=cf:c1, timestamp=1472992081375, value=1
 a                      column=cf:c2, timestamp=1472992090434, value=2
 b                      column=cf:c1, timestamp=1472992104339, value=3
 b                      column=cf:c2, timestamp=1472992099611, value=4
 c                      column=cf:c1, timestamp=1472992112657, value=5
 c                      column=cf:c2, timestamp=1472992118964, value=6
3 row(s) in 0.0540 seconds
  8. Create a table based on the snapshot and view data in the table.
    1. Create a table based on the snapshot. 
      clone_snapshot 'test_snapshot','test_2'
    2. View data in the table. 
      scan 'test_2'
      The following information is returned: 
      ROW                     COLUMN+CELL
 a                      column=cf:c1, timestamp=1472992081375, value=1
 a                      column=cf:c2, timestamp=1472992090434, value=2
 b                      column=cf:c1, timestamp=1472992104339, value=3
 b                      column=cf:c2, timestamp=1472992099611, value=4
 c                      column=cf:c1, timestamp=1472992112657, value=5
 c                      column=cf:c2, timestamp=1472992118964, value=6
3 row(s) in 0.0540 seconds